| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H |
| #define _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H |
| |
| #include <__config> |
| #include <__iterator/iterator.h> |
| #include <__iterator/iterator_traits.h> |
| #include <iosfwd> // for forward declaration of basic_streambuf |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| _LIBCPP_SUPPRESS_DEPRECATED_PUSH |
| template<class _CharT, class _Traits> |
| class _LIBCPP_TEMPLATE_VIS istreambuf_iterator |
| #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) |
| : public iterator<input_iterator_tag, _CharT, |
| typename _Traits::off_type, _CharT*, |
| _CharT> |
| #endif |
| { |
| _LIBCPP_SUPPRESS_DEPRECATED_POP |
| public: |
| typedef input_iterator_tag iterator_category; |
| typedef _CharT value_type; |
| typedef typename _Traits::off_type difference_type; |
| typedef _CharT* pointer; |
| typedef _CharT reference; |
| typedef _CharT char_type; |
| typedef _Traits traits_type; |
| typedef typename _Traits::int_type int_type; |
| typedef basic_streambuf<_CharT,_Traits> streambuf_type; |
| typedef basic_istream<_CharT,_Traits> istream_type; |
| private: |
| mutable streambuf_type* __sbuf_; |
| |
| class __proxy |
| { |
| char_type __keep_; |
| streambuf_type* __sbuf_; |
| _LIBCPP_INLINE_VISIBILITY __proxy(char_type __c, streambuf_type* __s) |
| : __keep_(__c), __sbuf_(__s) {} |
| friend class istreambuf_iterator; |
| public: |
| _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;} |
| }; |
| |
| _LIBCPP_INLINE_VISIBILITY |
| bool __test_for_eof() const |
| { |
| if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof())) |
| __sbuf_ = nullptr; |
| return __sbuf_ == nullptr; |
| } |
| public: |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {} |
| _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT |
| : __sbuf_(__s.rdbuf()) {} |
| _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT |
| : __sbuf_(__s) {} |
| _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT |
| : __sbuf_(__p.__sbuf_) {} |
| |
| _LIBCPP_INLINE_VISIBILITY char_type operator*() const |
| {return static_cast<char_type>(__sbuf_->sgetc());} |
| _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++() |
| { |
| __sbuf_->sbumpc(); |
| return *this; |
| } |
| _LIBCPP_INLINE_VISIBILITY __proxy operator++(int) |
| { |
| return __proxy(__sbuf_->sbumpc(), __sbuf_); |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const |
| {return __test_for_eof() == __b.__test_for_eof();} |
| }; |
| |
| template <class _CharT, class _Traits> |
| inline _LIBCPP_INLINE_VISIBILITY |
| bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a, |
| const istreambuf_iterator<_CharT,_Traits>& __b) |
| {return __a.equal(__b);} |
| |
| template <class _CharT, class _Traits> |
| inline _LIBCPP_INLINE_VISIBILITY |
| bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a, |
| const istreambuf_iterator<_CharT,_Traits>& __b) |
| {return !__a.equal(__b);} |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H |